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    <title>clEnqueueAcquireD3D11ObjectsKHR</title>
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    <div class="refentry">
      <a id="id-1"></a>
      <div class="titlepage"></div>
      <div xmlns="" class="refnamediv">
        <a xmlns="http://www.w3.org/1999/xhtml" id="clEnqueueAcquireD3D11ObjectsKHR"></a>
        <h1>clEnqueueAcquireD3D11ObjectsKHR</h1>
        <p>Acquire OpenCL memory objects that have been created from Direct3D 11 resources</p>
      </div>
      <div class="refsynopsisdiv">
        <h2></h2>
        <div class="funcsynopsis">
          <table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
            <tr valign="bottom">
              <td>
                <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
                <a class="link" href="scalarDataTypes.html" target="pagedisplay">cl_int</a>
                    <strong class="fsfunc">clEnqueueAcquireD3D11ObjectsKHR</strong>(</code>
                <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_command_queue</a>
                     <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">command_queue</var>, </td>
              </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">cl_uint</a>
                     <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">num_objects</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>const <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_mem</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*mem_objects</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">cl_uint</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">num_events_in_wait_list</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>
                    const <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_event</a>
                     <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*event_wait_list</var>
                , </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_event</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*event</var><code>)</code></td>
            </tr>
          </table>
        </div>
      </div>
      <div class="refsect1">
        <a id="parameters"></a>
        <h2>Parameters</h2>
        <div class="variablelist">
          <dl class="variablelist">
            <dt>
              <span class="term">
                <code class="varname">command_queue</code>
              </span>
            </dt>
            <dd>
              <p>
                    A valid command-queue.
                </p>
            </dd>
            <dt>
              <span class="term">
                <code class="varname">num_objects</code>
              </span>
            </dt>
            <dd>
              <p>
                    The number of memory objects to be acquired in <code class="varname">mem_objects</code>.
                </p>
            </dd>
            <dt>
              <span class="term">
                <code class="varname">mem_objects</code>
              </span>
            </dt>
            <dd>
              <p>
                     A pointer to a list of OpenCL memory objects that were created from
                     Direct3D 11 resources.
                </p>
            </dd>
            <dt>
              <span class="term"><code class="varname">num_events_in_wait_list</code>, <code class="varname">event_wait_list</code></span>
            </dt>
            <dd>
              <p>
                  Specify events that need to complete before this particular
                  command can be executed.  If <code class="varname">event_wait_list</code>
                  is NULL, then this particular command does not wait on any
                  event to complete. If <code class="varname">event_wait_list</code> is
                  NULL, <code class="varname">num_events_in_wait_list</code> must be 0. If
                  <code class="varname">event_wait_list</code> is not NULL, the list of events
                  pointed to by <code class="varname">event_wait_list</code> must be valid and
                  <code class="varname">num_events_in_wait_list</code> must be greater than 0. The events
                  specified in <code class="varname">event_wait_list</code> act as synchronization points.
                </p>
            </dd>
            <dt>
              <span class="term">
                <code class="varname">event</code>
              </span>
            </dt>
            <dd>
              <p>
                  Returns an event object that identifies this particular command and
                  can be used to query or queue a wait for this particular command to
                  complete. <code class="varname">event</code> can be NULL in which case it will not be
                  possible for the application to query the status of this command or queue a wait
                  for this command to complete.  If the <code class="varname">event_wait_list</code> and the
                  <code class="varname">event</code> arguments are not NULL, the <code class="varname">event</code>
                  argument should not refer to an element of the <code class="varname">event_wait_list</code>
                  array.
                </p>
            </dd>
          </dl>
        </div>
      </div>
      <div class="refsect1">
        <a id="notes"></a>
        <h2>Notes</h2>
        <p>
          The Direct3D 11 objects are acquired by the OpenCL context associated with
          <code class="varname">command-queue</code> and can therefore be used by all command-queues
          associated with the OpenCL context.
        </p>
        <p>
          OpenCL memory objects created from Direct3D 11 resources must be acquired before
          they can be used by any OpenCL commands queued to a command-queue. If an OpenCL
          memory object created from a Direct3D 11 resource is used while it is not currently
          acquired by OpenCL, the call attempting to use that OpenCL memory object will return
          <code class="constant">CL_D3D11_RESOURCE_NOT_ACQUIRED_KHR</code>.
        </p>
        <p>
          If <code class="constant">CL_CONTEXT_INTEROP_USER_SYNC</code> is not
          specified as <code class="constant">CL_TRUE</code> during context creation,
          <code class="function">clEnqueueAcquireD3D11ObjectsKHR</code> provides the synchronization
          guarantee that any Direct3D 11 calls involving the interop device(s) used in the
          OpenCL context made before <code class="function">clEnqueueAcquireD3D11ObjectsKHR</code>
          is called will complete executing before <code class="varname">event</code> reports
          completion and before the execution of any subsequent OpenCL work issued
          in <code class="varname">command_queue</code> begins. If the context was created with
          properties specifying <code class="constant">CL_CONTEXT_INTEROP_USER_SYNC</code> as
          <code class="constant">CL_TRUE</code>, the user is responsible for guaranteeing that any
          Direct3D 11 calls involving the interop device(s) used in the OpenCL context made
          before <code class="function">clEnqueueAcquireD3D11ObjectsKHR</code> is called have completed
          before calling <code class="function">clEnqueueAcquireD3D11ObjectsKHR</code>.
        </p>
        <p>
      General information about sharing memory objects with Direct3D 11 follows.
    </p>
        <p>
       The goal of this extension is to provide
      interoperability between OpenCL and Direct3D 11. This is designed to function analogously
      to the OpenGL interoperability. If this extension is
      supported by an implementation, the string       
      <a class="citerefentry" href="cl_khr_d3d11_sharing.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_d3d11_sharing</span></span></a>
      will be present in the
      <code class="constant">CL_PLATFORM_EXTENSIONS</code> or <code class="constant">CL_DEVICE_EXTENSIONS</code> 
      string described in the table of allowed 
      values for <code class="varname">param_name</code> for 
      <a class="citerefentry" href="clGetDeviceInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetDeviceInfo</span></span></a>.

    </p>
        <p>
      As currently proposed the interfaces for this extension would be provided in
      <code class="code">cl_d3d11.h</code>.
    </p>
        <p>
       This section discusses OpenCL functions that allow
      applications to use Direct3D 11 resources as OpenCL memory objects. This allows efficient
      sharing of data between OpenCL and Direct3D 11. The OpenCL API may be used to execute
      kernels that read and/or write memory objects that are also Direct3D 11 resources. An
      OpenCL image object may be created from a Direct3D 11 texture resource. An OpenCL buffer
      object may be created from a Direct3D 11 buffer resource. OpenCL memory objects may be
      created from Direct3D 11 objects if and only if the OpenCL context has been created from
      a Direct3D 11 device.
    </p>
        <p>
       An OpenCL memory object created from a
      Direct3D 11 resource remains valid as long as the corresponding Direct3D 11 resource has
      not been deleted. If the Direct3D 11 resource is deleted through the Direct3D 11 API,
      subsequent use of the OpenCL memory object will result in undefined behavior, including
      but not limited to possible OpenCL errors, data corruption, and program termination.
    </p>
        <p>
       The successful creation of a
      cl_context against a Direct3D 11 device specified via the context create parameter
      <code class="constant">CL_CONTEXT_D3D11_DEVICE_KHR</code> will increment the internal Direct3D
      reference count on the specified Direct3D 11 device. The internal Direct3D reference
      count on that Direct3D 11 device will be decremented when the OpenCL reference count on
      the returned OpenCL context drops to zero.
    </p>
        <p>
      The OpenCL context and corresponding command-queues are dependent on the
      existence of the Direct3D 11 device from which the OpenCL context was created. If the
      Direct3D 11 device is deleted through the Direct3D 11 API, subsequent use of the OpenCL
      context will result in undefined behavior, including but not limited to possible OpenCL
      errors, data corruption, and program termination.
    </p>
        <p>
       Properties of Direct3D 11 objects may be queried
      using <a class="citerefentry" href="clGetMemObjectInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetMemObjectInfo</span></span></a>
      and <a class="citerefentry" href="clGetImageInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetImageInfo</span></span></a>
      with <code class="varname">param_name</code> <code class="constant">CL_MEM_D3D11_RESOURCE_KHR</code> and
      <code class="constant">CL_IMAGE_D3D11_SUBRESOURCE_KHR</code> as described for <a class="citerefentry" href="clGetImageInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetImageInfo</span></span></a> and in the information 
below about accessing mapped regions of a memory object. 
    </p>
        <h4><a id="id-1.6.13"></a>Accessing mapped regions of a memory object</h4>
        <p>
      This section describes the behavior of OpenCL commands that access 
      mapped regions of a memory object.
    </p>
        <p>
        The contents of the region of a memory object and associated memory objects 
        (sub-buffer objects or 1D image buffer objects that overlap this region) mapped 
        for writing (i.e. <code class="constant">CL_MAP_WRITE</code> or 
        <code class="constant">CL_MAP_WRITE_INVALIDATE_REGION</code> is set in <code class="varname">map_flags</code> 
        argument to <a class="citerefentry" href="clEnqueueMapBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapBuffer</span></span></a> 
        or <a class="citerefentry" href="clEnqueueMapImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapImage</span></span></a>) are 
        considered to be undefined until this region is unmapped.
    </p>
        <p>
        Multiple commands in command-queues can map a region or overlapping regions of a memory
        object and associated memory objects (sub-buffer objects or 1D image buffer objects that
        overlap this region) for reading (i.e. <code class="varname">map_flags</code> = <code class="constant">CL_MAP_READ</code>). 
        The contents of the regions of a memory object mapped for reading can also be read by kernels 
        and other OpenCL commands (such as 
        <a class="citerefentry" href="clEnqueueCopyBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueCopyBuffer</span></span></a>) executing on a device(s).
    </p>
        <p>
        Mapping (and unmapping) overlapped regions in a memory object and/or associated memory
        objects (sub-buffer objects or 1D image buffer objects that overlap this region) for writing 
        is an error and will result in <code class="constant">CL_INVALID_OPERATION</code> error returned by 
        <a class="citerefentry" href="clEnqueueMapBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapBuffer</span></span></a> 
        or <a class="citerefentry" href="clEnqueueMapImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapImage</span></span></a>.
    </p>
        <p>
        If a memory object is currently mapped for writing, the application must ensure that the memory
        object is unmapped before any enqueued kernels or commands that read from or write to this
        memory object or any of its associated memory objects (sub-buffer or 1D image buffer objects)
        or its parent object (if the memory object is a sub-buffer or 1D image buffer object) begin
        execution; otherwise the behavior is undefined.
    </p>
        <p>
        If a memory object is currently mapped for reading, the application must ensure that the memory
        object is unmapped before any enqueued kernels or commands that write to this memory object
        or any of its associated memory objects (sub-buffer or 1D image buffer objects) or its parent
        object (if the memory object is a sub-buffer or 1D image buffer object) begin execution;
        otherwise the behavior is undefined.
    </p>
        <p>
        Accessing the contents of the memory region referred to by the mapped pointer that has 
        been unmapped is undefined.
    </p>
        <p>
        The mapped pointer returned by 
        <a class="citerefentry" href="clEnqueueMapBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapBuffer</span></span></a> 
        or <a class="citerefentry" href="clEnqueueMapImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapImage</span></span></a> can be used as
        <code class="varname">ptr</code> argument value to 
        <a class="citerefentry" href="clEnqueueReadBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueReadBuffer</span></span></a>, 
        <a class="citerefentry" href="clEnqueueWriteBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueWriteBuffer</span></span></a>, 
        <a class="citerefentry" href="clEnqueueReadBufferRect.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueReadBufferRect</span></span></a>, 
        <a class="citerefentry" href="clEnqueueWriteBufferRect.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueWriteBufferRect</span></span></a>,
        <a class="citerefentry" href="clEnqueueReadImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueReadImage</span></span></a>, and 
        <a class="citerefentry" href="clEnqueueWriteImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueWriteImage</span></span></a>, 
        provided the rules described above are adhered to.
    </p>
      </div>
      <div class="refsect1">
        <a id="errors"></a>
        <h2>Errors</h2>
        <p>
          Returns <span class="errorname">CL_SUCCESS</span> returns <span class="errorname">CL_SUCCESS</span>
          if the function is executed successfully. If <code class="varname">num_objects</code> is 0 and
          <code class="varname">mem_objects</code> is NULL then the function does nothing and returns
          <span class="errorname">CL_SUCCESS</span>. Otherwise it returns one of the following errors:
        </p>
        <div class="itemizedlist">
          <ul class="itemizedlist" style="list-style-type: disc; ">
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if <code class="varname">num_objects</code>
              is zero and <code class="varname">mem_objects</code> is not a NULL value or if
              <code class="varname">num_objects</code> &gt; 0 and <code class="varname">mem_objects</code> is NULL.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_MEM_OBJECT</span> if memory objects in
              <code class="varname">mem_objects</code> are not valid OpenCL memory objects or if memory
              objects in <code class="varname">mem_objects</code> have not been created from Direct3D
              11 resources.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_COMMAND_QUEUE</span> if <code class="varname">command_queue</code>
              is not a valid command-queue.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_CONTEXT</span> if context associated with
              <code class="varname">command_queue</code> was not created from a Direct3D 11 context.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_D3D11_RESOURCE_ALREADY_ACQUIRED_KHR</span> if memory
              objects in <code class="varname">mem_objects</code> have previously been acquired using
              <code class="function">clEnqueueAcquireD3D11ObjectsKHR</code> but have not been released using
              <a class="citerefentry" href="clEnqueueReleaseD3D11ObjectsKHR.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueReleaseD3D11ObjectsKHR</span></span></a>.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_D3D11_RESOURCE_ALREADY_ACQUIRED_KHR</span> when any of
              <code class="varname">mem_objects</code>are currently acquired by OpenCL.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_EVENT_WAIT_LIST</span>
              if <code class="varname">event_wait_list</code> is NULL and
              <code class="varname">num_event_in_wait_list</code> &gt; 0,
              or <code class="varname">event_wait_list</code> is  not NULL and
              <code class="varname">num_event_in_wait_list</code> is 0, or if event objects in
              <code class="varname">event_wait_list</code> are not valid events.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_OUT_OF_HOST_MEMORY</span> if there is a failure to allocate
              resources required by the OpenCL implementation on the host.
            </li>
          </ul>
        </div>
      </div>
      <div class="refsect1">
        <a id="specification"></a>
        <h2>Specification</h2>
        <p><img src="pdficon_small1.gif" />
            <a href="http://www.khronos.org/registry/cl/specs/opencl-1.2-extensions.pdf#page=108" target="OpenCL Spec">OpenCL Specification</a>
        </p>
      </div>
      <div class="refsect1">
        <a id="seealso"></a>
        <h2>Also see</h2>
        <p>
            <a class="citerefentry" href="cl_khr_d3d11_sharing.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_d3d11_sharing</span></span></a>,
            <a class="citerefentry" href="clGetDeviceIDsFromD3D11KHR.html"><span class="citerefentry"><span class="refentrytitle">clGetDeviceIDsFromD3D11KHR</span></span></a>,
            <a class="citerefentry" href="clCreateFromD3D11BufferKHR.html"><span class="citerefentry"><span class="refentrytitle">clCreateFromD3D11BufferKHR</span></span></a>,
            <a class="citerefentry" href="clCreateFromD3D11Texture2DKHR.html"><span class="citerefentry"><span class="refentrytitle">clCreateFromD3D11Texture2DKHR</span></span></a>,
            <a class="citerefentry" href="clCreateFromD3D11Texture3DKHR.html"><span class="citerefentry"><span class="refentrytitle">clCreateFromD3D11Texture3DKHR</span></span></a>,
            <a class="citerefentry" href="clEnqueueReleaseD3D11ObjectsKHR.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueReleaseD3D11ObjectsKHR</span></span></a>
        </p>
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      <div xmlns="" class="refsect3" lang="en" xml:lang="en"><a xmlns="http://www.w3.org/1999/xhtml" id="Copyright"></a><h4 xmlns="http://www.w3.org/1999/xhtml"></h4><img xmlns="http://www.w3.org/1999/xhtml" src="KhronosLogo.jpg" /><p xmlns="http://www.w3.org/1999/xhtml"></p>Copyright © 2007-2011 The Khronos Group Inc.
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and/or associated documentation files (the
"Materials"), to deal in the Materials without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Materials, and to
permit persons to whom the Materials are furnished to do so, subject to
the condition that this copyright notice and permission notice shall be included
in all copies or substantial portions of the Materials.
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